Glad I found this site. I plan on purchasing a $200 desk at Staples soon. Can anyone give me some advice on getting the price down?

I was thinking of using the In-Store kiosk to order and pay in-store:

1. $50 off $200 coupon code (anyone have printable e-mail coupon?)
2. Upon checkout, use the $30 off $150 Printable In-store coupon (16 digit).

Will this work? I've heard that Staples calls people and asks them to fax them the ORIGINAL $50 off $200 coupon? I've also heard that the 16-digit codes only work once right? Do you think the cashier/manager will notice?